[android-developers] to check the combination of pressed buttons

I have 4 buttons (a1, a2, b1, b2). They can combinate: a1-b1; a1-b2;
a2-b1; a2-b2.It means that "a1" and "a2" cann't be chosen together. So
after clicking "a1" I need to block "a2".And depends on what 2 buttons
were pressed, it will be differenet actions.I tried something like
this

if(a1.isPressed()){
a2.setEnabled(false);
a2.invalidate();}
else if (b1.isPressed()){
b2.setEnabled(false);
b2.invalidate();}

but it didn't work.Does anyone have an idea how I can do it? Thank you
in advance!

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